JPH04360600A - Printed board fixing device - Google Patents

Abstract

PURPOSE: To provide a device for fixing plural width substrates on a main printed substrate. CONSTITUTION: An outside tube part comprising an outside tube part 1 and an inside axis part 7 is fixed on a main substrate, with the internal axis part built in the external tube part while pressed downward with springing action. With a width substrate receiving tongue part 2 to the left and right, outside of the external tube part, an operator rotates manually the internal axis part so that an pressing tongue part 12 is protruded out of an opening part 3, and inserting a sub-substrate between the upper/lower pair of tongue parts, plural sub/substrate end parts are fixed in layers on both left and right from the center part of main substrate. A screwing operation for attaching a sub-substrate on the main substrate, as required so far, is not required, while detaching/re- attaching at service work being easier.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a printed circuit board mounting device for mounting a plurality of sub-printed circuit boards on a main board, and particularly to a printed circuit board mounting device that is easy to install and remove during assembly and maintenance. Regarding.

0002

[Prior Art] As shown in FIG. 4, conventionally, the main board 3
When mounting the sub board 33 on the main board 35 in multiple layers, the mounting part has screws 31 and spacer tubes 32 at multiple locations on the main board 35.
, was fixed by a screw receiving member 35. However, such fixing means require a work process in which the screws are passed through the holes in the sub-board, then through the holes in the spacer tube and the main board, and finally, the screws are tightened using the tapping part of the screw receiving member. Therefore, there was a problem that the number of man-hours for the work increased, and therefore the cost became high.

0003

[Problems to be Solved by the Invention] As mentioned above, in the past, the sub-board was fixed directly onto the main board by screwing it, so the number of man-hours was reduced by the work process for tightening the screws. This also made it difficult to remove and reinstall during maintenance work. SUMMARY OF THE INVENTION An object of the present invention is to provide a printed circuit board fixing device that solves the above-mentioned problems and is capable of fixing a plurality of sub-boards on the left and right sides from the center of the main board.

0004

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a holding device consisting of an outer cylindrical portion and an inner shaft portion is fixed upright to the center of the main board, and both sides of the outer cylindrical portion are fixed. The inner shaft part is rotatably fixed, and when the inner shaft part is manually rotated by the operator, the presser tongue part is placed on the outer cylinder part. It protrudes from the opening provided above the receiving part and holds the sub-board in a sandwiched manner, eliminating the need for conventional screw-fastening work.

[0005]

[Function] The printed circuit board fixing device of the present invention includes board receiving tongues provided on the left and right sides of the outside of the external cylindrical portion, serving as lower receiving tongues, and holding tongues arranged in pairs at the upper portion on the internal shaft portion. When the operator manually rotates the internal shaft part, the presser tongue protrudes from the external cylinder part, and by sandwiching the sub-board between the pair of upper and lower tongue parts, multiple pieces are pressed to the left and right from the center of the main board. Sub-boards can be incorporated in multiple layers, eliminating the need for conventional fixing screws.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of the present invention, in which 1 is an external cylinder part, 2 is a sub-board receiving tongue part, 3 is an opening part, 1
0 is a fixing ring groove provided in the foot portion of the external cylinder portion 1, 7
1 is an internal shaft portion, 8 is a foot portion, 9 is a fixing ring groove, 11 is a knob portion, 12 is a presser tongue portion, 4 is a fixing ring, and the internal shaft portion is fixed by the groove portion 9 so as to be rotatable, and 5 is a fixed ring. A spring attached between the rings 4 presses down the internal shaft portion, and the presser tongue portion 12 has the function of pressurizing the sub-board 21.

A convex portion (not shown) is provided on the foot portion of the external cylinder portion 1 so as to correspond to a key portion provided in the mounting hole 22 shown in FIG. The foot portion of the external cylinder portion is inserted into a keyed mounting hole 22 on the main board 20 and fixed to a fixing ring groove 10 protruding from the back side of the main board by a fixing ring 6 so as not to rotate.

FIG. 2(A) shows a sectional view taken along the line A-A in a state in which the outer cylindrical portion 1 and the inner shaft portion 7 are combined and the shaft portion is not rotated. FIG. 2(B) shows a state after the internal shaft portion has been rotated, and shows a state in which the presser tongue portion 12 protrudes from the opening portion 3. The material used for the outer cylinder part 1 and the inner shaft part 7 is made of castable metal, but it is also possible to use a plastic material. When a conductive material is used, it is used as a common ground wire for the sub-boards. In this way, the sub-board receiving tongue 2 and the holding tongue 12 are paired up and down to sandwich the sub-board, and at the same time, surface pressure is applied to the sub-board 21 by the holding tongue 12 due to the action of the spring 5.

As shown in FIG. 3, according to this embodiment, when fixing a plurality of sub-boards 21 on the main board 20 in multiple layers, it is possible to do so without using screws, so that the work of tightening the screws is simplified. This eliminates the need for a process, shortens the production process, reduces costs, and makes it easier to remove and install during maintenance.

0010

[Effects of the Invention] According to the present invention, when fixing a plurality of sub-boards on a main board in multiple layers, there is no need for a screw fastening process, reducing the number of work processes, reducing manufacturing costs, and reducing maintenance costs. It is easy to remove and attach, and by using a conductive material, it can also serve as a common ground wire for the sub-boards.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

[Fig. 2] Fig. 2 (A) and (B) show the outer cylinder part 1 and the inner shaft part 7.
Cross-sectional views of the combined state before and after rotation.

FIG. 3 is a diagram showing a method of attaching a sub-board onto a main board.

FIG. 4 is a diagram showing a conventional means for fixing a sub-board onto a main board.

[Explanation of symbols]

1 External cylinder part 2 Sub-board receiving tongue 3 Opening 4 Internal shaft fixing ring 5 Spring 6 External cylinder fixing ring 7 Internal shaft part 8 Foot of internal shaft 9 Internal shaft fixing ring groove 10 External cylinder part fixing ring groove 11 Knob section 12 Internal shaft holding tongue 20 Main board 21 Sub board 22 Mounting hole 31 Screw 32 Spacer tube 33 Sub board 34 Main board 35 Screw receiving member

Claims (1)

[Claims] 1. A cylindrical member; an internal shaft portion supported rotatably within the cylindrical member and slidable along the cylinder;
A board fixing device for holding a plurality of sub-boards in a multi-layered manner on a main printed board, the board-fixing device comprising an elastic member that presses the internal shaft part in the board-fixing direction of the cylindrical member, the cylindrical member comprising: It has a tongue-like part that projects vertically to support the lower surface of the sub-board, an opening provided above the tongue-like part, and a fixing member that fixes the cylindrical member to the board; The shaft part has a presser tongue part provided at a position corresponding to the opening part of the cylindrical member and protrudes from the opening part when rotated, and the sub-board is supported by the tongue part. A printed circuit board fixing device characterized in that the inner shaft portion is rotated to sandwich and support the sub-board between the tongue portion and the pressing tongue portion.